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GlobalISel: Avoid widening unmerge with matching source type

Authored by arsenm on Jul 30 2019, 1:00 PM.



If the target result type matches the original source, don't widen the
source register.

Also continue converging AMDGPU merge/unmerge legality rules towards
what they should be.

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Event Timeline

arsenm created this revision.Jul 30 2019, 1:00 PM
This revision is now accepted and ready to land.Aug 13 2019, 9:50 AM